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The prime minister of Poland accused the European Council president Donald Tusk of being part of “an attempt to overthrow the [Polish] government”.

In a letter to her fellow EU leaders, Polish Prime Minister Beata Szydło said that Mr Tusk had “decided to violate multiple times his European mandate” and intervened in “heated national disputes”.

The comments are the harshest yet in a growing dispute ahead of Mr Tusk’s re-selection as head of the European Council. Although Mr Tusk is a former prime minister of Poland, Warsaw has decided to nominate another candidate for the top job, creating a complicated diplomatic row.

Mr Tusk has been a historic opponent of Ms Szydło’s Law and Justice party, which controls the Polish government. To read the full letter, click here.